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NetNewsWire/Evergreen/MainWindow/Detail/ArticleRenderer.swift

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Swift
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Add a whole ton more code.
2017-05-27 19:43:27 +02:00
//
// ArticleRenderer.swift
// Evergreen
//
// Created by Brent Simmons on 9/8/15.
// Copyright © 2015 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import RSCore
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import Data
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var cachedStyleString = ""
var cachedTemplate = ""
class ArticleRenderer {
let article: Article
let articleStyle: ArticleStyle
lazy var longDateFormatter: DateFormatter = {
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .medium
return dateFormatter
}()
lazy var mediumDateFormatter: DateFormatter = {
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
dateFormatter.timeStyle = .short
return dateFormatter
}()
lazy var shortDateFormatter: DateFormatter = {
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .short
dateFormatter.timeStyle = .short
return dateFormatter
}()
lazy var title: String = {
if let articleTitle = self.article.title {
return articleTitle
}
return ""
}()
lazy var baseURL: URL? = {
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var s = self.article.url
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if s == nil {
s = self.article.feed?.homePageURL
}
if s == nil {
s = self.article.feed?.url
}
if s == nil {
return nil
}
Avoid URL fragment in base URL, since the webview won’t accept that as a base URL. Fix #32.
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var urlComponents = URLComponents(string: s!)
if urlComponents == nil {
return nil
}
// Can’t use url-with-fragment as base URL. The webview won’t load. See scripting.com/rss.xml for example.
urlComponents!.fragment = nil
if let url = urlComponents!.url {
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if url.scheme == "http" || url.scheme == "https" {
return url
}
}
return nil
}()
var html: String {
return renderedHTML()
}
init(article: Article, style: ArticleStyle) {
self.article = article
self.articleStyle = style
}
// MARK: Private
private func textInsideTag(_ text: String, _ tag: String) -> String {
return "<\(tag)>\(text)</\(tag)>"
}
private func styleString() -> String {
if let s = articleStyle.css {
return s
}
if cachedStyleString.isEmpty {
let path = Bundle.main.path(forResource: "styleSheet", ofType: "css")!
let s = try! NSString(contentsOfFile: path, encoding: String.Encoding.utf8.rawValue)
cachedStyleString = "\n\(s)\n"
}
return cachedStyleString
}
private func template() -> String {
if let s = articleStyle.template {
return s
}
if cachedTemplate.isEmpty {
let path = Bundle.main.path(forResource: "template", ofType: "html")!
let s = try! NSString(contentsOfFile: path, encoding: String.Encoding.utf8.rawValue)
cachedTemplate = s as String
}
return cachedTemplate
}
private func linkWithTextAndClass(_ text: String, _ href: String, _ className: String) -> String {
return "<a class=\"\(className)\" href=\"\(href)\">\(text)</a>"
}
private func linkWithText(_ text: String, _ href: String) -> String {
return "<a href=\"\(href)\">\(text)</a>"
}
private func titleOrTitleLink() -> String {
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if let link = article.preferredLink {
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return linkWithText(title, link)
}
return title
}
private func substitutions() -> [String: String] {
var d = [String: String]()
let title = titleOrTitleLink()
d["newsitem_title"] = title
d["article_title"] = title
let body = article.body == nil ? "" : article.body
d["article_description"] = body
d["newsitem_description"] = body
var feedLink = ""
if let feedTitle = article.feed?.nameForDisplay {
feedLink = feedTitle
if let feedURL = article.feed?.homePageURL {
feedLink = linkWithTextAndClass(feedTitle, feedURL, "feedLink")
}
}
d["feedlink"] = feedLink
d["feedlink_withfavicon"] = feedLink
let longDate = longDateFormatter.string(from: article.logicalDatePublished)
d["date_long"] = longDate
let mediumDate = mediumDateFormatter.string(from: article.logicalDatePublished)
d["date_medium"] = mediumDate
let shortDate = shortDateFormatter.string(from: article.logicalDatePublished)
d["date_short"] = shortDate
return d
}
private func renderedHTML() -> String {
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var s = "<!DOCTYPE html><html><head>\n\n"
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s += textInsideTag(title, "title")
s += textInsideTag(styleString(), "style")
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s += """
<script type="text/javascript">
function startup() {
var anchors = document.getElementsByTagName("a");
for (var i = 0; i < anchors.length; i++) {
anchors[i].addEventListener("mouseenter", function() { mouseDidEnterLink(this) });
anchors[i].addEventListener("mouseleave", function() { mouseDidExitLink(this) });
}
}
function mouseDidEnterLink(anchor) {
window.webkit.messageHandlers.mouseDidEnter.postMessage(anchor.href);
}
function mouseDidExitLink(anchor) {
window.webkit.messageHandlers.mouseDidExit.postMessage(anchor.href);
}
</script>
"""
s += "\n\n</head><body onload='startup()'>\n\n"
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s += RSMacroProcessor.renderedText(withTemplate: template(), substitutions: substitutions(), macroStart: "[[", macroEnd: "]]")
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s += "\n\n</body></html>"
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// print(s)
return s
}
}
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